Gas oven



Patented ,Apr. :20, 1937 PATENT OFFICE GAS OVEN Jan Hendrik Windemuller, The Hague, Netherlands, assignor to Maatschappij van Berkels Patent N. V., Rotterdam, Netherlands, a corporation of the Netherlands Application June 10, 1936,-Serial No. 84,527 In the Netherlands May 15, 1935 3 Claims.

The efliciency of gas'ovens is ordinarily decreased by loss of heat caused by the. conduction of heat to the walls of the oven and by the withdrawal of the combustion gases from said oven.

5 The heat of these gases is partially absorbed by the walls which diminish the heat in the oven space. space also carry with them a substantial amount of heat which must be replaced by hot combuslO tion gas delivered to the oven space.

Since these discharged gases have a far lower temperature than the gases in the oven space the transfer of heat to the walls along which" the escaping gases flow will be diminished.

The efiiciency of gas ovens moreover is greatly dependent on a regular circulation of the hot combustion gases in the oven space.- 1

Ordinarily the ascending gases create a strong draught in the chimney, so that a large amount of cold air is drawn in and discharged into the oven space.

The present invention has for its purpose to obviate the drawbacks described above.

According to the invention chimneys are pro- 5 vided with draught guiding members along which air and gases from the heating'space may be drawn into the chimney. This will greatly improve the circulation in the heating space, so that a uniform temperature will prevail all-through the same, which makes the heating space as a whole more suitablefor baking and other processes based upon heating, for which processes in the gas ovens hitherto known only a given zone could be utilized.

According to the invention a partition is provided between the discharge opening arranged in ornear the bottom of the heating space and" the draught guiding member thus preventing direct communication between the same.

- According to the invention the chimneys are closed at the top and areprovided with discharge openings in one or more of the side walls to rehard the air current and thereby facilitate the heating of the air.

When carrying. out the measures described above it will be made possible that the openings in the bottom of the heating space, the chimneys and/or the gas burners are shorter than the dimensio'ns or the heating space measured in the same direction, which will result in tire advantage that ii the burners are turned low, considerably less cold air will be drawn in.

The invention will now be further explained with the aid or the drawing illustrating an em- The gases discharged from the oven bodiment of the invention intended for a baking oven.

Fig. 1 is a diagrammatical vertical section through the oven on line I-I of Fig. 2.

Fig. 2 is a section according to the line II--II 5 in Fig. 1.

The baking space I of the oven is enclosed by a double wall 2, 3. In the bottom 4 of the baking space there are provided openings 5, below which there are located the gas burners 6. Chimneys 10 1 extending high into the baking room are mounted on the base 4 of the oven and are operatively connected with the openings 5, which chimneys near their lower ends are provided with a draught guiding member 8. In the rear wall 15 of the baking room there is provided a discharge opening 9.' Between the discharge openings and the draught guiding member 8 there is arranged a partition ID, in order to prevent direct communication between the same. 20

The warm air settling between the partition l0 and the wall will flow out. of the opening 9, thus 1 enabling additional heated air to enter the oven through the openings 12. The heated air in the oven flows downwardly adjacent the chimneys I and then upwardly through the draught guiding member 8 where it is reheated, thereby maintaining a constant circulation of hot air in the oven; caused primarily by the upward flow of the heated air in the chimney 1. The outwardly 30 extending sides of the guiding member 8 serves to conduct the air somewhat remote from the chimney into the chimney and accelerates the flow of the air.

The hot combustion gases from the gas burners 3 6 rising up in the chimneys I will create a draught in said chimneys, by which draught the gases and air from the baking room flowing past the draught guide 8 will be drawn along, which will produce an intensive circulation of said gases 40 and air through the entire baking space. i only the combustion gases and hardly any air Since the discharge of the combustion gases are provided in the side walls, the hot gases discharged by the same are given a direction which is highly favourable to a uniform distribution of heat throughout theentire baking room. 55

Between the discharge opening 9 and the draught interrupting members 8 there is provided a partition III, which serves to separate the current of exit air from the current which is drawn 5 into the chimney 'l.

10 said base being provided with an opening, a

heating element operatively positioned below said opening, an air heating chimney mounted in. the oven and spaced above said opening and remote from the walls whereby said chimney receives 15 air from. the inside of the oven for reheating and from the outside of the oven for initial heating.

2. In combination with a chimney for a gas oven as set forth in claim 1, of a draught guiding member surrounding the lower end of the chimney, whereby air is directed into the base of the chimney.

3. A baking -oven comprising end and side walls, a top, and a base, said base being provided with an opening, an air heating element operatively positioned below said opening, a chimney in said oven positioned and spaced above said opening, one of said walls having a discharge opening at the lower part thereof to provide an exit for the air, and a partition in proximity to the discharge opening extending longitudinally thereof and arranged to separate the exit current of air from the current which is drawn into the chimney.-

J AN HENDRIX 

